Other testing groups have only compared a small set of sites manually, Blaze said.

Additionally, of the 1,000 sites tested, 175 were customized for mobile access. The iPhone improved the time to load a mobile Web site by 39% over other standard Web sites, while Android improved the difference in the two types of sites by 8%. Still, Android loaded both types faster than the iPhone 4.

Most of the testing Blaze conducted was over Wi-Fi in a home using a high-speed router connected to a fast DSL line, but it also conducted some 3G testing (with nearly 6 Mbit/sec download speed over the Bell Mobility HSPA network) with iPhone 4 running iOS 4.2 this time. In that comparison, it found Wi-Fi was faster in 82% of the cases, but only by half a second.